Improvement in sewing-machines



W. H. LANDFEAR.

Sewing Machine.

No. 16,281. Patented Dec. 23, 1856.

`and I do hereby declare that the following is a fulhclear, and exact description of the contlc-guide, showing the manner of its lconneccranlr, E, as shown in-Fig. 2. The two cranks the needle I. This bar is made dat at G, and :furnished with a -slot extending lengthwise,

other arm of the lever is connected with thev y bearings through which the crank D passes.

UNITED STATES PATENT OFFICE.

,WM R. LANDFEA-R, OF` MANCHESTER, CONNECTICUT.

IMPROVEMENT IN SEWlNGf-MACHINES.

Specification forming part of`Lett'c'rks Patent No. 16,2Sl; dated December 21,' 1856:

.To all when@ it may concern:

y Beit known Ithat I, WILLIAM R. LAnDrEAR, of Manchester, in the county-of Hartford and State of Connecticut, have invented new and luseful Improvements on the Sewing-Machine;

struction and operation of the same,referenoe being had to. the annexed drawings, making a part of this specification, in which- Figure lis a'view in perspectiveof themachine. Fig. 2 is a view` of the shaft detached from the machine; Fig. 3,v a side View of the barv for working the needle; Fig. 4, a rear view 'of the same; and Fig. 5,' a-rear view of the slruttion with the frame.

This l`machine .works with two threads, one

carried by a needle and the other by a shuttle,

thus ,forming the firm lock-stitch in the man- 11er ofthe ordinary shuttle-machine.

A B is the 4frame to which the working parts are secured.

C is ashait fitted in bearings in the standards of .the frame. This shaft is bent in the form of the crank D,Which extends nearly the wholelength of theshait. At the extremity of this crank farthest from thebearing in the standard B of the frame is another and shorter D andE are on opposite sides of the center of shaft C, so that upon the revolution ofk the shaft one crank will descend while theother isv rising.

To the crank D is attached abar, F'G,whicl1 carries the arm H, for the purpose of working throughwhich the pin J passes, thus securing it to the standard B of the frame. This slotted part G ef the bar F Gactsasa lever, to one arm of which the arm ,II 'issecured at a, the arm H extending over the top of the plate O. The needle I is secured to the arm H at b. The

crank Di, which passes through the lever or bar at c. The part. F of the bar F vGris made to extend over the crank D, andparallel with it the wholelengthofthe crank, the end d being bent down for the crank to pass through. Thus the parts c and d form twosockets or This is for the purpose of holding the lev'er G, and consequently the arm H, more firmly than would be possible with only similar bearings.

The pin J acts as afulcrum onjwhich the lever plays as the shaft revolves.

To the crank E is attached the shuttle-guide K, the crank -passing through this shuttleguide at e. It is secured .to` one-oi' the stand- .which the crank is attached. By the above arrangement the shuttle-guide is caused to descend while the needle rises, carrying with it the shuttle, which may be in any convenient forin, and may be attached to the shuttle-guide, near the top, in any proper manner, between it and the plate M, which is secured to the standards'A A, and extends across the frame from side to side. Thus the under or shuttle ,thread is drawn in -a direction nearly oppositel to that in which the needle-thread is drawn when the stitch is tightened, instead of adirection at right angles with that of the needle thread, as is citen the case in other shuttlemachines. When the shaft C is rotated, the crank `D on descending draws down the needlebar F G H, carrying the'needle through the cloth, which is laid on Vthe plate 0,"the bar sliding on the fulcrurn J. As the lower end ofthe bar is carried around by the crank, the needle I draws the cloth forward a short dis'- tan ce for a stitch. At the same time the crank E carries the shuttle-guide forwardcarrying the shuttle. through between the needle and 'the thread which it carries. The crank D now raises -the needle and draws up' the loop of thread through which the shuttle has passed,- whi-le the shuttle descends and draws the other thread tight. The length of stitch is regulated by raising and lowering the fulcrilm J WVhen this fulcrum is at the same height as the plate O, the needle must enter the cloth in the same place in whichit rises; but when the fulerum is placed lower than the plate, thereby shortening the lower arm of the lever G and lengthening the upper arm, which carries .the needlearln H, the point of the needle is carried around s o far as to enter the cloth a short distance A from the place where it was retracted, this distance depending upon the difference between the height ofthe fulorum and that ofthe plate O.

I do not claim the forming of the seam by means of the needle and shuttle, or the feeding of the cloth by theneedle; but

vWhat I claim as my invention, and desire to secure by Letters Patent, is-

1. The manner of regulating the length of stitch by raising and lowering the fulcrum J, thereby changing vthe relative lengths of' the two arms of the lever G. as described.

2. The manner of combining the shuttlegude K with the crank E and. fulorum N, for the purpose of giving the shuttle a downward motion when the stitch is tightened, in the manner set forth.

WILLIAM R. L ANDFEAR.

Witnesses:

M. LANDFEAR, L. LANDFEAR. 

